I do a lot of computer work in coffee shops, and have been happy with my Sony MDR-V6's, but I really want to ditch the cord. I believe I want closed-back, since I want to take advantage of the passive noise cancelling of the over-ear pads to block out as much chatter as possible. Comfort is my primary requirement, followed by sound. A mic to take phone calls would be nice, if possible.
I know that at the sub-$100 price point, my options are limited. But I'd really appreciate any suggestions you have!